I guess that's a difficult pill to swallow if you espouse nationalist economic policies, but this isn't about Us vs. Them; we're talking about preventing massive devastation on a global scale. And the Paris accord was just the first step. We'll need to spend much more than Trump is already unwilling to pay if we want to avert disaster.
United States $57,436
China $8,113
India $1,723
It's easy to say that everyone should be held to the same standard when you're already the richest. The US uses 7032 kg of oil equivalent/capita, China 2029 kg/capita, India 614 kg/capita [1]. If you really want to hold everyone to the same standard you could cut your energy use by an order of magnitude and still use more than India. It's ridiculous to hear an american president try to paint developing countries as energy thirsty when the three most sold vehicles in the US are pickup trucks while most people in China and India can't afford any kind of car [2].
Like you said, it's a global problem. It won't be solved by whining about "unfair" economic terms and bragging about opening more coal mines.
[0] https://en.wikipedia.org/wiki/List_of_countries_by_GDP_(nomi...
[1] https://en.wikipedia.org/wiki/List_of_countries_by_energy_co...
[2] http://www.businessinsider.com/best-selling-cars-trucks-vehi...
[1] https://www.theguardian.com/environment/2011/apr/21/countrie... [2] http://climatecommunication.yale.edu/publications/paris_agre...
Sure, but guess what: China is right behind us. History means squat. They're a major polluter _right now_. Why are they not held to the same standard we are?
But as for why they are important, I think that there is some relationship between how people live and per-capita emissions. So if you ignore the population size and only look at net emissions, the people in larger countries would be held to a higher standard than the people in the smaller countries.
China's GDP was 10.87 trillion USD in 2015 vs 17.95 trillion USD for the US. GDP per capita was 7,926 in 2015 vs 55,836 in the US. China is still a poor country.
When China reaches a comparable GDP per capita, then we can expect comparable cuts to be on the table.
Until then expecting sharp cuts from developing countries will not be a viable alternative.
Things I've learned in life(mostly the hard way) include that fair is not a thing and does not exist.
[1]https://www.c2es.org/international/key-country-policies/chin...